CREATE TABLE [dbo].[tb_UsoDeExtraclases]
(
[idExtraClase] [int] NOT NULL IDENTITY(1, 1),
[Paquete] [int] NOT NULL,
[FechaDesde] [datetime] NOT NULL,
[FechaHasta] [datetime] NULL,
[Cantidad] [int] NOT NULL
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[tb_UsoDeExtraclases] ADD CONSTRAINT [PK_tb_UsoDeExtraclases] PRIMARY KEY NONCLUSTERED  ([idExtraClase]) ON [PRIMARY]
GO
